#include"iostream"
#include"cstring"
#include"algorithm"
#include"stack"
#include"unordered_map"

using namespace std;

const int N = 100010;

stack<int> num;
stack<char> op;

void eval(){
	auto b = num.top(); num.pop();
	auto a = num.top(); num.pop();
	auto c = op.top(); op.pop();
	int x;
	if(c == '+') x = a + b;
	else if(c == '-') x = a - b;
	else if(c == '*') x = a * b;
	else x = a / b;
	num.push(x);
}

int main()
{
	string str;
	unordered_map<char, int> pr{{'+', 1}, {'-', 1}, {'*', 2}, {'/', 2}};
	cin >> str;
	for(int i = 0; i < str.size(); i++)
	{
		auto c = str[i];
		if(isdigit(c))
		{
			int x = 0, j = i;
			while(j < str.size() && isdigit(str[j]))
				x = x*10 + str[j++] - '0';
			num.push(x);
			i = j - 1;
		}
		else if(c == '(') op.push(c);
		else if(c == ')')
		{
			while(op.top() != '(') eval();
			op.pop();
		}
		else
		{
			while(op.size() && pr[op.top()] >= pr[c]) eval();
			op.push(c);
		}
	}
	while(op.size()) eval();
	cout << num.top() << endl;
}